Hello Chris, I hoped you actually would be the one to answer me ;-) 

> What you want is a
> two-dimensional function, which you *could* create using a one-dimensional
> spline (e.g. specify spline points with only x co-ords).

	Okay, I forgot the 'time' dimension and focused on 2D vectors as
it was the shortest way to see my spline curve... and again I was wrong
concerning the maths behind. I'm curious to see if I could manage it using
only x coords...
 
> For this I would recommend my
> Automatic Clock Modifier macros:
>    http://www.geocities.com/ccolefax/clockmod.html

	How could I miss that one ??!! It's strange I never tried to use
this other great utility I heard about quite a long time ago... I think
it's because at that time I simply didn't tried to animate anything in
POV. I started to read the tutorial linked from your page, and sure will
use these macros ! Woah this rocks... as everything you do for us !
	Thanks Chris ! Long life to your amazing work ;-)


*** Nicolas Calimet
*** http://pov4grasp.free.fr

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